Examine source code of Keyboard Pin plus

{
  "name": "Keyboard Pin",
  "version": "0.3",
  "description": "Creates a keyboard shortcut (Alt + Shift + P) to toggle the pinned state of the currently selected tab",
  "background": {
    "persistent": false,
    "scripts": [
      "background.js"
    ]
  },
  "commands": {
    "toggle-pin": {
      "suggested_key": {
        "default": "Alt+Shift+P"
      },
      "description": "Toggle tab pin"
    }
  },
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{22f2fa7b-bc0e-4ed0-a603-38ab0a791ff2}"
    }
  }
}